Cannon-pinion for watches.



UNITED STATES PATENT OFFICE;

OLIVER F. TEED, OF CHICAGO, ILLINOIS,

ASSIGNOR, BY MESNE ASSIGN- MENTS, TO I'IIMSELF, WILLIAM F. PRAWIZ, AND LOUISE LEUBRIE,

OF SAME PLACE.

CANNON-PINION FOR WATCHES.

SPECIFICATION forming part of Letters Patent N o. 681,839, dated September 3, 1901. Application filed November 30, 1900l Serial No. 38,108. (No model.)

To all wwm t may concern:

Be it known that I, OLIVER F. TEED, a citizen ofthe United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Cannon-Pinions for Watches, of which the following is a speciiication.

This invention relates to improvements in horology or watchmaking; and it consists in certain peculiarities of the construction, novel arrangement, and operation of that part of a watch known as the cannon-pinion, as will be hereinafter more fully set forth and specifically claimed.

As is Well known to those skilled in the art of watchmaking, the cannon-pinion must be held in position on the center arbor by frictional contact therewith, so that the hands of the watch may be adjusted or set when required, and itis also a well-known fact that the said pinion by reason of long or continuous usage frequently becomes loose on the center arbor, and thus causes the hands to fail to operate properly. Heretofore cannonpinions have been held in position on their arbors or shafts by means of a spring or part of the barrel of the pinion made integral therewith or attached thereto in such a manner that the free portion of the spring or part of the barrel of the pinion which acts as a spring would impinge the arbor, and thus hold the pinion in frictional contact with the arbor. This construction has been found objectionable for the reason when the said spring becomes worn or broken it necessitates the use of a new pinion or requires a great deal of skill and labor to repair it.

It is therefore the principal object of my invention to provide a cannon-pinion for watches or other devices in which such pinions may be used which shall be so constructed that it will be held in position on its arboror shaft by the frictional contact of one or more clamps which are separate and detached from the barrel of the pinion, to the end that when the arbor clamp or clamps shall become Worn, so as to render the operationfof the watch unsatisfactory, a new clamp or clamps may be readily employed instead of the old ones and will render the work of repairing an easy matter.

In order to enable others skilled in the art to which my invention pertains to make and use the same, I will now proceed to describe it, referring to the accompanying drawings, in which I have shown on an enlarged scale a portion of the center arbor of a watch and a cannon-pinion embodying myinvention.

Figure l is a view in elevation of a portion of the center arbor of a watch with my improved cannon-pinion mounted thereon and illustrating,r by dotted lines the position of the hour and minute hands. Fig. 2 is a sectional view taken on line 2 2 of Fig. l. Fig. 3 is a detached perspective view of one form of the clamp used for holding the pinion in position on the arbor. Fig. et is a detached view of the pinion, showing the recess in the barrel thereof for the reception of the retainingclamp. Figs. 5 and 6 are end views representing modified forms of the retaining-rv clamp; and Fig. '7 is a view in elevation of the pinion, showing it with two clamps in position in its recess.

Similar letters refer to like parts throughout the different views of the drawings.

A represents the center arbor of a watch or the arbor or shaft upon which the cannonpinion is mounted. This pinion consists of a Wheel B, having gear-teeth h, of the ordinary or any preferred construction, and of a barrel C, which is provided with a recess c, of any suitable size and shape, but preferably with its ends in parallelism, as is clearly shown in Fig. 4 of the drawings. Within the recess cis located a retaining-clamp D, which is preferably made of spring-steel, but may be of any other suitable material, and is preferably so formed that when in position on the arbor or shaft A its outer surface will be flush with the periphery of the barrel C of the pinion. In forming the recess c in the barrel C of the pinion I prefer to cutaway a little more than half of that portion of the barrel in which the recess is formed, so that the clamp D may embrace the arbor and extend its edges a little beyond the diametrical as is clearly shown and line of the arbor,

lowing the clamp a larger surface for frictional contact.

While I prefer to construct the barrel and clamp as above set forth and as shown in Fig. 2 of the drawings, yet I may make the clamp so that it will embrace less than onehalf of the circumference of the arbor without departing from the spirit of my invention. i

. wheel or disk, a barrel connected thereto and having a recess larger than one-halt` of its` t circumference,and a clamping portion located In Figs. 5 and 6 of the drawings I have shown modifications in the construction of the clamp, which consist,in the first instance, in cutting away the inner central portion, as at d, of the clamp to afford more resiliency, and in the second instance I have shown the outer central portion cut away, as at CZ', for the same purpose.

I-n Fig. 7 of the drawings I have shown the pinion provided with two clamps D, as I may sometimes use one, two, or more of them to formi the clamping portion, and in such event esmas proper size to fit the worn arbor, and for this purpose various sizes of the clamps may be kept in stock by the jeweler or watchmaker. Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A cannon pinion comprising a toothed in said recess and formed to embrace more fthan one-half of the circumference of t'h'e arbor and to engage the arbor with its sidel edges, substantially as described.

OLIVER F. TEED.-

Witnesses:

CHAs. C. 'T1LLMAN,l A. GUs'rArsoN. 

